Simple, remove the spaces from the string, then return the resultant string.

void main() { group("Basic tests", () { test("Testing for '8 j 8 mBliB8g imjB8B8 jl B'", () => expect(noSpace('8 j 8 mBliB8g imjB8B8 jl B'), equals('8j8mBliB8gimjB8B8jlB'))); test("Testing for '8 8 Bi fk8h B 8 BB8B B B B888 c hl8 BhB fd'", () => expect(noSpace('8 8 Bi fk8h B 8 BB8B B B B888 c hl8 BhB fd'), equals('88Bifk8hB8BB8BBBB888chl8BhBfd'))); test("Testing for '8aaaaa dddd r '", () => expect(noSpace('8aaaaa dddd r '), equals('8aaaaaddddr'))); test("Testing for 'jfBm gk lf8hg 88lbe8 '", () => expect(noSpace('jfBm gk lf8hg 88lbe8 '), equals('jfBmgklf8hg88lbe8'))); test("Testing for '8j aam'", () => expect(noSpace('8j aam'), equals('8jaam'))); }); }

내답:

String noSpace(String x) => x.replaceAll(new RegExp(r"\s+"), "");

String noSpace(String x) => x.split(' ').join('');

String noSpace(String x) => x.replaceAll(" ", "");